Electrical signaling



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' Application led ulfully 26, 1922. Serial No. 577,664.

To all whom t may concern.' A

Be it known that we, JOsEPH C. MAW' larly to the receiving of radiosignals, and

, a system for use in practising the same.

The object of the present invention is to 15.' eliminate electrostaticdisturbances and other interferences inthe reception of radio-sig- 'nalsand thus improve the clearness and reliability of radio communication.

l ln pending application, Serial Number 440,203,5filed 'January 26,1921, we have described a methodfor receiving radio signals '1n whichresonance wave collsare employed.'

and for utilizing the wave development effects produced by electricaloscillations acting on the antenna. The present invention isanothenmodiiication of the same general idea embodying some additionalfeatures which are novel and useful in securing still greaterimprovements in the results desired, vi z., more eii'ective'eliminationof static disturbances andJother interferences in thereception of radio signals.

In view ofthe fact thatl the underlying principles Oi the presentinvention are the same as those utilized in the pendingapplicationreferred to above, and also in the 'pending applications,Serial Numbers 401,7 52 and 419,383, itis not deemed necessary to repeathere the discussion of the basic principles4 governing its operation. Weshall limit the description to the novel features introduced yin thepresent invention, and this can 'be more readily understood by referenceto the accompanying diagrams showing typical embodyments of the..invention, and which form part of the specification.

In the accompanying .drawings Figure 1 is a diagrammatic view of theinvention in which the antenna is connected in series with a loopcircuit, and the wave coil connected to the antenna circuit either aboveor below the loop circuit.

1n. Figure 2 an additional intermediate circuit is introduced betweenthe detector circuit and the metal ring which forms` an electrostaticconnection to the wave coil.

Another embodiment ofour invention is shown 1n Figure 3 inwhich a loopantenna' circuit is employed, grounded at one end, andthe Wave coilconnected to the grounded end of the' loop circuit.

Figure a is a modification'of Figure 3 'which consists in introducing aloop circuit betweenv the antenna and ground.

Another modiication of our invention is shown in Figure 5 Awhich issimilar to FigVV ure 3 except that an additional metal tube, groundedthrough a loop circuit, is used. y The arrangement shown in Figure 6 issimilar to that of Figure 4 except that an additionalv metal tube,grounded through a loo circuit, is used. I

laving more particular reference to the drawings,`and in connection withwhich like characters of reference will designate cor! responding partsthereof, vin'vFigure 1 the antenna 1 'is connected -to a. loop circuitwhich consists of an inductance2, `and a condenser 3 connected parallel,the other terminal of the loop'circuit being grounded at 4. The circuit1, 2, 3, 4, constitutes the antenna circuitg- The wave coil 5 isconnected to the antenna circuit, the connection being made either atthe point 20, that is at a polnt above the loop circuit "or at the point6, at lthe grounded end of t e4 loop circuit. Thiais accomplished bychanging the switch connection 21 from point v22 to point 23.

Part of the wave coll 5 is enclosed in the metal tube 7 which isgrounded at the point 8 through a separate loop circuit/consistingy ofan inductanc'e 9 and .condenser 10 connected in multiple. The ring 11constitutes an electrostatic connection between the wave coil 5 and theoscillating circuit 12-13, the detector being connected acrossthe'terminals of condenser 13. The principles of operation covering thiscircuit arrangement have al\ ready been fully discussed in the pending"lt is to be circuit. lit was found by experiment thatA I theintroductionof an additional loop circuit, 2,'3, in the antenna circuitoers astill further-improvement in the elimination 'of static andother'interference. This is particularly marked `when the wave coil 1sconnectedto the point 6vat the grounded end 10 the ring 11. The ring 11is in this case con- -nected t a circuit consisting of condensers 114,16 and an inductance 15. This circuit 14, 15, 16, is` coupled tothe'detector circuit 12,13. i

. In Figure 3 an arran ement is shown in which a loop antenna 41 antennabeing closed through a condenser 18 and grounded at 19. The wave coil 5is connected at the point 6, which is the grounded 20 end of the loopantenna circuit. In this v case .we also have an intermediate circuit,14, 15, 16, between the detector circuit proper 12, l13, and the ring11, which constitutes the electrostatic connection to thewave coil.

The'modilication shown in Figure 4 diters fronrthat shown in Figure 3only in that an additionalloop circuit consisting of an inductance 2andcapacity 3 joined in `parallel is interposed between the loop antenna 1718, and the ound 19. In this case we also'have a swltch 21 for thepurpose of connectingthe wave coil either to a point 20 or point 6, that1s to a point .abovethe loop circuit `or to a point below the loopcircuit.

Still another modification is shown in Figure 5 which issimilari toFigure 3 except that a metal tube 7 grounded at 8 through loip circuit9, 1 0, is used.

ire `6 is a modificationof Figure 4 having t eadditional feature of ametal tube 7,1grounded atl 8, through loopl circuit 9, 0. ;,v A Claims:Affl 131 1. In a lsysteml for the reception of radio signals, thecombination of an antenna, a loop circuit and ground constituting anantenna circuit, a wave coil" connected to the junction point of theantenna and loop j circuit, part of said wave. coil being enclosed in ametal tube, said metal tube be ing grounded throughan independent loopcircuit, said wave coil bein also electrically connected to a detector trough an oscillating circuit. 2. In a system for 'the reception ofradio. signals, the combination of an antenna, loop circuit andl ground'constituting an antenna fcircuit, a wave coil'and a switching ar- 460rangement for connecting said wave coil either to a oint above the loopcircuit or to a point elow the loop circuit of the antenna circuit, saidwave coil being enclosed in a metal tube, said metal tube being groundedthrough an independent loop ciris used, the loopl venclosed in a metaltube, `said metal tube 1 being. grounded through an independent loopcircuit, a detector being connected S0 across an oscillating circuit,said oscillating circuit being electrostatically connected to the saidwavecoil throu h a metal ring, said metal ring being slid wave coil.

4. In a system for the reception of radio signals, the combination of anantenna, loop circuit and ground constitutinr an antenna circuit, a wavecoil and a switcling arrange- 4ment for connecting sald wave coil eitherto a point above the loo circuitl or to a point below the loop circuitof the antenna circuit, said wave coil being enclosed in a metal tube,saidl metal tube being grounded through an independent loop circuit, adetector associated with said wave coil through two oscillating circuitsin electrical relation to each other, the detector being connected toone of said oscillating circuits, and the other ofsaid oscillatingcircuits being e011-, nected through a metal ring which is slidablealong the wave coil,- said metal ring constituting an electrostaticconnection bebetween the wave coil and detector circuits.

5. In a system for receiving radio signals the combination of a loopantenna, said loop antenna bein closed through a condenser and one en ofsaid'condenser being grounded, a wave coil connected to the grounded endof said loop antenna and a etector electrically associated with saidwave coil throu h two oscillating circuits which are electricallycoupled, the detector being connected to one of said oscillatingcircuits and the other of -said oscillating circuits being connectedelectrically -to the Said wave coil.

. 6. In a system for receiving radio signals the combination of a loopantenna, said loop antenna being closed through a condenser and one endof said condenser being grounded, a wave coil connected to the groundedend of said loop antenna and a etector electrically associated with saidwave coil through two oscillating circuits which are electricallycoupled, the detector being connected to Ione of said oscillatingcircuits andthe other of said oscillating circuits being connectedelectro-statically through a metal ring to the said wave coil. 130

able along the `A antenna circuit and ground,'a wave coil connected tovsaid loop antenna circuit and a ydetector associated electrically withsaid wave coil through two oscillating circuits, said oscillationcircuits being coupled electri'cally.'

- 8. In a nals, the combination of a loop antenna, said loop antennabeing closed through a condenser, a loop circuit interposed between saidloop antenna circuit and ground, a Wave coil and a switching arrangementfor connecting the wavecoil to tue loop antenna circuit either to apoint above the antenna loop circuit or to a point belowthe antenna loopcircuit, a detector associated electrically with said wave coil throughtwo oscillating circuits, said two oscillating circuits beingelectrically coupled.

9. In a system for receiving radio signals, the combination of a loopantenna, said loop antenna being closed through a condenser, a loopcircuit interposed between `said loop antennal circuit and ground, awave coil and a switching arrangement for connecting the wave coil tothe loop antenna circuit either to `a point above the antenna loopcircuit or to a point below the antenna loop circuit, a detector beingelectrically associated with said wave coil through two oscill latingcircuits, said two oscillating circuits being electrically coupled, saiddetector being connected to one of said oscillating circuits, and theother ofsaid oscillating'cirysystem for receiving'radio sigcuits beingconnected electrostatically to the;V

Wave coil through a metal ring.

10. In a system for receiving radio signals, a combination of a loopantenna, Said loop antenna being closed throu h a condenser, oneterminal of said con enser being grounded, a wave coil connected to thegrounded terminal of said loop antenna circuit, part of said wave coilbeing enclosed in a metal tube, said metal tube being grounded through aseparate loop circuit, a detector electrically associated with said wavecoil through two oscillating circuits, saidtwo oscillating circuitsbeing electrically coupled, the said detector being connected across theterminals of one of said oscillating circuits, the other of saidoscillating cir? cuits being connected electrostatically to the saidwave coil.

'11. In a system for receiving radio si nals, the combination of a loopantenna, said loop antenna being closed through a conu denser, (oneterminal of said condenser being grounded through a loop circuit, a Wavecoil and a switching arrangement for connecting said wave -coil to theloop antenna circuit either to a point above the loop circuit or to apoint below the said loop circuit, a metal tube enclosing partvof saidwave coil, said metal tube being grounded through an independentloop-circuit, a detector associated electrically through two oscillatingA circuits with said wave coil, the said two oscillating circuits beingelectrically cou led.

In testimony whereof we affix our signatures.

` JOSEPH O. MAUBORGNE. 'I

LOUIS COHEN.v

